Posted by **Zach** on Wednesday, April 21, 2010 at 7:39pm.

How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit?

Please help :)

thanks

-Zach

- Math -
**jennifer**, Wednesday, April 21, 2010 at 8:06pm
9a

- Math (need help) -
**PsyDAG**, Thursday, April 22, 2010 at 12:46pm
Let a = hundreds, b = tens, c = ones

a ≤ b ≤ c

Examples of what you are seeking are:

111

112

113...

122

123

124...

133

134

135...

222

223

224...

...999

Unfortunately, I cannot think of an equation to help you solve this problem. Sorry.

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